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Boiling point

Link to relevant study record(s)

Reference

Endpoint:

boiling point

Type of information:

experimental study

Adequacy of study:

key study

Study period:

16 December 2014 to 05 February 2015

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Remarks:

The study was conducted according to an internationally recognised method, and under GLP. The substance is considered to be adequately characterised with its purity. Therefore full validation applies.

Qualifier:

according to guideline

Guideline:

OECD Guideline 103 (Boiling Point)

Deviations:

no

Qualifier:

according to guideline

Guideline:

EU Method A.2 (Boiling Temperature)

Deviations:

no

Qualifier:

according to guideline

Guideline:

EPA OPPTS 830.7220 (Boiling Point / Boiling Range)

Principles of method if other than guideline:

Not applicable

GLP compliance:

yes

Type of method:

differential scanning calorimetry

Specific details on test material used for the study:

- Storage condition of test material: In refrigerator (2-8°C) protected from light, container flushed with nitrogen
- Stability at higher temperatures: Yes, maximum temperature: 40°C, maximum duration: 10 days

Key result

Boiling pt.:

215 °C

Atm. press.:

1 014 hPa

Decomposition:

no

Preliminary study

From 75 °C upwards the weight of the sample decreased significantly. At 174 °C the sample weight had decreased by 25%. After the experiment it was observed that the test substance was evaporated from the sample container.

 

Main study

During heating, an endothermic peak between 150 °C and 250 °C was observed in Experiment 1. The extrapolated onset temperature of the peak was 215.16 °C. The effect was most likely obtained due to evaporation of the test substance. After the experiment it was observed that the test substance evaporated from the sample container.

To investigate the boiling peak between 150 °C and 250 °C a hermetically closed sample container was applied in the Experiment 2. The extrapolated onset temperature of the evaporation peak was 226.54 °C. The endothermic peak shifted to higher temperatures. It demonstrated that evaporation of the test substance was the reason for the endothermic effect. Because the experiment was performed under higher pressure, the extrapolated onset temperature was not used for calculation of the boiling temperature. After the experiment it was observed that the test substance evaporated from the sample container.

Experiment 3 was performed to determine the duplicate boiling temperature of the test substance. The extrapolated onset of the evaporation peak was 215.57 °C. After the experiment it was observed that the test substance evaporated from the sample container.

The boiling temperature was determined as the average boiling temperature obtained from Experiment 1 (215.16 °C) and Experiment 3 (215.57 °C).

Executive summary:

The boiling point of the test substance was determined, under GLP, according to OECD 103 / EU A2 guideline, using Differential Scanning Calorimetry.

Three experiments were performed under inert (nitrogen) atmosphere: The boiling temperature was determined as the average boiling temperature obtained from Experiment 1 (215.16 °C) and Experiment 3 (215.57 °C). Experiment 2 was performed under higher pressure for confirmatory purpose, the extrapolated onset temperature was not used for calculation of the boiling temperature. After each experiment, it was observed that the test substance evaporated from the sample container.  

The boiling temperature of test substance was determined at 215 °C (489 K) at 1014 ± 1 hPa.

Description of key information

The boiling point was measured at 215°C, under 1014 hPa (not corrected to normal atmP) and inert atmosphere.

Key value for chemical safety assessment

Boiling point at 101 325 Pa:

215 °C

Additional information

A fully reliable experimental study, conducted according to a recognized OECD/EC method and under GLP, is available. It is considered as a key study, and the result is retained as key data.